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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 1.遍历数组，直接遍历
        let arr = ['借口','就算是我不懂',55,true];
        console.log(arr[0]);
        console.log(arr[1]);
        console.log(arr[2]);
        console.log(arr[3]);

        // 2.for 循环，遍历索引号
        for(let i = 0;i < 4;i++){
            // console.log(i);
            console.log(arr[i]);
        }

        // 3.数组的长度
        for(let i = 0;i<arr.length;i++){
            console.log(arr[i]);
        }
    </script>
</body>
</html>